00640cam a2200205 4500 548370409 TxAuBib 20220206120000.0 220206s2022||||||||||||||||||||||||eng|u 67331 Project Gutenberg PGUSA eng TxAuBib Playfair, John. Illustrations of the Huttonian Theory of the Earth [Gutenberg] / John Playfair. Project Gutenberg, 2022. Project Gutenberg ; 67331 Public domain in the USA. Electronic text. Project Gutenberg ; 67331. http://www.gutenberg.org/ebooks/67331 TXTLL